patch 9.0.0195: metafun files are not recogized

Problem:    Metafun files are not recogized.
Solution:   Add filetype detection patterns.

runtime/filetype.vim

@@ -1160,6 +1160,7 @@ au BufNewFile,BufRead *.mf			setf mf
 
 " MetaPost
 au BufNewFile,BufRead *.mp			setf mp
+au BufNewFile,BufRead *.mpxl,*.mpiv,*.mpvi	let b:mp_metafun = 1 | setf mp
 
 " MGL
 au BufNewFile,BufRead *.mgl			setf mgl

src/testdir/test_filetype.vim

@@ -361,7 +361,7 @@ let s:filename_checks = {
     \ 'monk': ['file.isc', 'file.monk', 'file.ssc', 'file.tsc'],
     \ 'moo': ['file.moo'],
     \ 'moonscript': ['file.moon'],
-    \ 'mp': ['file.mp'],
+    \ 'mp': ['file.mp', 'file.mpxl', 'file.mpiv', 'file.mpvi'],
     \ 'mplayerconf': ['mplayer.conf', '/.mplayer/config', 'any/.mplayer/config'],
     \ 'mrxvtrc': ['mrxvtrc', '.mrxvtrc'],
     \ 'msidl': ['file.odl', 'file.mof'],

src/version.c

@@ -735,6 +735,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    195,
 /**/
     194,
 /**/